De or het personalisering?

The correct Dutch article is:

de personalisering

Rule Words ending in -ing: almost always de. See the rule

How to use personalisering

the personaliseringde personalisering
this personaliseringdeze personalisering
that personaliseringdie personalisering
our personaliseringonze personalisering
your personaliseringjouw personalisering
every personaliseringelke personalisering
which personalisering?welke personalisering?
a big personalisering / the big personaliseringeen grote personalisering, de grote personalisering